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Fair Value Measurements (Tables)
12 Months Ended
Jul. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of fair value on a recurring basis and where they are classified within the fair value hierarchy
   July 31, 2022 
   Level 1   Level 2   Level 3   Total 
Assets:  (in thousands) 
Available-for-sale securities  $
   $36,698   $
   $36,698 
Hedge funds   
    
    4,764    4,764 
Total  $
   $36,698   $4,764   $41,462 

 

   July 31, 2021 
   Level 1   Level 2   Level 3   Total 
Assets:  (in thousands) 
Hedge funds  $
   $
   $5,268   $5,268 
Total  $
   $
   $5,268   $5,268 

 

Schedule of changes in the fair value of the assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
   Year Ended July 31, 
   2022   2021 
   (in thousands) 
Balance, beginning of period  $5,268   $7,510 
Liquidation of Hedge Fund Investments   
    (7,000)
Total (loss) gain included in earnings   (504)   4,758 
Balance, end of period  $4,764   $5,268